Renaming and/or moving wiki pages is a good thing, but leaving a
redirect is absolutely essential. Presumably this applies to all
wikis, not just this one.

Moving or renaming a page means you thought it would be better
to have a different title, and changed it. Wikis thrive on, and
indeed only exist because of, this kind of community involvement.
Thank you! You have just helped to improve and evolve the wiki.

That being said, there's a lot of old stuff on the Internet.
Out-dated XML Sitemaps, cached pages, mirrored pages, the Wayback
Machine, pages not getting crawled as often as they should, etc. If
you don't know what some of those things are, that's okay. The
point is, if you move or rename a page without a redirect, all
those sources wil…